Modified Rankin Scale Calculator

Modified Rankin Scale Calculator for Neurology. Higher categories reflect greater dependency; 6 records death. The scale is ordinal, so a one-point change is not a constant quantity. Original interobserver study: https://pubmed.ncbi.nlm.nih.gov/3363593/

For shared guidance on choosing a tool and documenting results, read the clinical calculator workflow.

How this calculator works

Assign one functional category from 0 through 6. The descriptors are paraphrased, not a reproduced structured interview. Category definitions: https://cdn.clinicaltrials.gov/large-docs/56/NCT02507856/Prot_000.pdf

When to use this calculator

Document functional status at an explicit time point, often after stroke. Baseline disability must not be confused with disability attributable to a new event.

Inputs used

  • Assessment context: baseline, current, discharge, 90 days or another documented time
  • Observed symptoms, usual activities, walking, bodily care and nursing dependence category

Clinical interpretation

Higher categories reflect greater dependency; 6 records death. The scale is ordinal, so a one-point change is not a constant quantity. Original interobserver study: https://pubmed.ncbi.nlm.nih.gov/3363593/

Worked example

Someone needs help with shopping and other activities but walks without another person helping. This can fit mRS 3, not 4; grade 4 requires assistance with walking and bodily care.

Limitations and safety notes

Rater disagreement and ambiguous assistance needs remain possible. This interface is not a validated structured interview or certification course. Avoid labeling people or their quality of life as good or poor from a category.

Frequently asked questions

Is mRS 3 the same as inability to walk?

No. Grade 3 retains walking without another person assisting, despite needing help in other activities.

References

  • van Swieten et al. Interobserver agreement, Stroke 1988: https://pubmed.ncbi.nlm.nih.gov/3363593/
  • PRODAST protocol v4.1, 2016, Table 12.1.4; mRS categories: https://cdn.clinicaltrials.gov/large-docs/56/NCT02507856/Prot_000.pdf

Editorial review and citation methodology

Maintained by the Quick Medical Calculator Editorial Team. Content record date: September 9, 2026. A content date is not evidence of independent clinical review. Individual clinical sign-off is not recorded on this page.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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